求翻译：本实验的不足：本实验是在离体条件下研究ATRA和紫杉醇对动物血管内皮细胞的作用，在人体内是否有同样的作用，有待于进一步深入研究。另一方面，在此浓度下对人体其他的细胞是否产生有害的影响，需要做进一步的基础和临床研究；两者能否合用于药物涂层支架，如何涂层，其安全性和临床效果是否优于目前的药物涂层支架等一系列问题还需要更多的物力、人力和时间去探索。是什么意思？

Lack of this experiment: under the condition of the experiment in vitro study on paclitaxel and ATRA on the role of vascular endothelial cells of animals, whether it has the same effect in humans, need to be further studied. The other hand, where concentrations have a harmful effect on whether other cells of the human body, additional basic and clinical research is necessary; both can used drug-coated stent, coated, its safety and clinical efficacy is better than the present drug-coated stent and a series of problems also need more resources, manpower and time to explore.